The amplitude of the motion of a body performing simple harmonic motion decreases with time because

• A. friction force dissipate the energy of motion
• B. the frequency of oscillation varies with time
• C. the period of oscillation varies with time
• D. energy is supplied by some external agency

Which of the following devices is used for storing electric charges?

• A. Transformer
• B. Ammeter
• C. Potentiometer
• D. Capacitor

From the diagram below, the bob of the pendulum has the fastest speed at

• A) X
• B) Y
• C) Z
• D) W

The efficiency of a machine is always less than 100% because the

• A. work output is always greater than the work input
• B. load lifted is always greater than the effort applied
• C. effort applied is always greater than the load lifted
• D. velocity ratio is always greater than the mechanical advantage

The following are the scores of ten students in a test of 20 marks: 15, 16, 17, 13, 16, 8, 5, 16, 19, 17. What is the modal?

• A. 13
• B. 15
• C. 16
• D. 19

A car travelling at a uniform speed of 120km h-1 passes two stations in 4 minutes. Calculate the distance between the two stations.

• A. 8km
• B. 15km
• C. 22km
• D. 30km

If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?

• A. 12cm
• B. 1cm
• C. 3cm
• D. 6cm

Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks

• A. i and ii
• B. i and iv
• C. ii and iii
• D. iii and iv

The distance xm travelled by a particle in time t seconds is described by the equation x = 10 + 12t², Find the average speed of the particle between the time interval t = 2s and t = 5s

• A. 60 ms^-1
• B. 72 ms^-1
• C. 84 ms^-1
• D. 108 ms^-1

The image of any real object formed by a diverging lens is always

• A. inverted
• B. magnified
• C. erect
• D. real